Here is your *real* question:
"I am trying something, and don't know what I am doing. What should I do?"
You should not put on a position until you have a **trading plan**.
For example:
1. I take profit when I achieve a yield of 15% on my risk for the trade.
2. I cover the trade when my loss is 20% of the risk.
3. I adjust the trade when the delta increases to.... etc.
See, for example, the webinars on CBOE.com by Dan Sheridan. You might look at the one on credit spreads.